power series for inverse function of tan(x)
let y = arc [ tan (x) ]
differentiate y with respect to x once to get y' and find y'(0)
then expand the derivative [ 1 + x^2]^ (-1) using binomial series
now you can differentiate the series as many times as you want and replace x with 0 .
Use the values to substituted into Mc laurin's series or Taylor's series.
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